Lenovo IdeaCentre B540 - Manual (Page 36)

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User Guide
Language settings
Press the MENU button on the remote control, then select Setup → Menu
Language.
Picture In Picture (PIP) Size
Press the MENU button on the remote control, then select PIP → PIP Size to
adjust the size of the sub-picture.
Note: When in PIP mode, press the button on the remote control to
alternate the video between the main picture and sub-picture.